Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1686b8278cedd23…

MALICIOUS

PDF

74.7 KB Created: 2021-02-17 18:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 13ca9d18634f6ee89d9177a8bc5bca89 SHA-1: ebff374561ed80002b4435e9a11d84dfbe110717 SHA-256: c1686b8278cedd239368fb40ec2d4ac08037f70b324a2acf0059c4e6daa54f29
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan threat. It impersonates WhatsApp, directing users to a malicious redirector URL that ultimately leads to a PDF hosted on a Weebly subdomain, likely serving as a lure for a password-protected archive. The presence of numerous external URIs and link farm characteristics further supports a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nodirerivono.weebly.com/uploads/1/3/6/0/136052085/temuk_gekum_kegovegunirat_zulizuw.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=uppababy+2020+vista+v2+stroller+-+sierra+%2528dune+knit%252Fsilver%252Fblack+leather%2529 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418781/normal_5ff3f7f9b53b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_5fd79c7098503.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383794/normal_60018b94543b3.pdfIn PDF document text
    • https://nodirerivono.weebly.com/uploads/1/3/6/0/136052085/temuk_gekum_kegovegunirat_zulizuw.pdfIn PDF document text
    • http://rusedewafizurap.66ghz.com/motu_aur_patlu_ki_jodi_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_5fcb1201c6608.pdfIn PDF document text
    • http://satomupudogoni.22web.org/apex_legends_for_macbook_pro.pdfIn PDF document text
    • http://soluzixod.66ghz.com/bacteriocin_typing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_602301d190f04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tedaxoj.epizy.com/12969590198.pdfIn PDF document text
    • http://rugupodat.epizy.com/afsoon_e_jaan_novel_part_2.pdfIn PDF document text
    • http://tadezaxe.rf.gd/tubakogixuji.pdfIn PDF document text
    • http://lumajenav.epizy.com/33211451003.pdfIn PDF document text
    • http://zoribele.epizy.com/synonyms_and_antonyms_complete_list.pdfIn PDF document text
    • http://marakolin.epizy.com/vevumudofowekisa.pdfIn PDF document text
    • http://besuwodusibix.rf.gd/sofadolozerogejo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 6016 bytes
SHA-256: 2e4db139808b2d070643afa2fe3e25c911ef8f1304dcfaf912a656c438a54655
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 11624 bytes
SHA-256: 6ef280b82db28a70e91db4cdafa4f34aa31cd1f78ed90ac402d54f03e0f70a8a

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